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1. Thread concept 1.1 comparison between threads and processes Threads are similar to processes, both of which have PCB s The underlying functions of both are the same, and both use clone Processes can become threads Under Linux, thread is the smallest unit of execution; process is the smallest uni ...

Source: https://blog.csdn.net/wh_sjc/article/details/70283843   IPC (InterProcess Communication) refers to the communication or exchange of information between different processes. IPC usually includes pipeline (including nameless pipeline and named pipeline), message queue, semaphore, shared storage, socket, Streams, etc. Soc ...

1, Date and time functions 1. Function to get the current dateIt's the same. It's different CURDATE() : Used to get the current date of the system CURRENT_DATE() Used by the system to get the current date mysql> select CURDATE(),CURRENT_DATE(); 2. Get function of current time CURTIME() : Used to get the current time of the system mysql& ...

fork function In many applications, creating multiple processes is an effective method for task decomposition. For example, a network server process can create a new subprocess to process each request while listening for client requests. At the same time, the server process will continue to listen for more client connection requests. Decomposin ...

1, Install dependency package and prepare environment. yum install -y gcc Depending on the package, you can install it according to the prompts at compile time. But gcc must be installed. 2, 1. Download the tar package, install and start it. wget http://source.goyun.org:8000/source/Redis/redis-3.2.9.tar.gz --2018- ...

1. Simple use Only one jar package of log4j needs to be imported, and the log4j.properties configuration file under the src directory will be loaded by default 1. Print log to console log4j.properties configuration file content #Set the log level to info and output to the console log4j.rootLogger=info,console log4j.appender.console = org ...

1. What is socket Socket is simply a combination of IP address and port, which can communicate with the application of remote host. A host can be determined by IP address, and an application can be determined by port. IP + port can completely determine an application of a host. Socket originated from UNIX, similar to a special file, can be open ...

Alibaba cloud's one click deployment script is used for deployment: curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun Create the required directory: mkdir -p /etc/docker /data/docker Then modify the configuration file of docker: /etc/docker/daemon.json {   "graph": "/data/docker",   "storage-driver": "overlay2",   "insecure-re ...

TCP In order to facilitate the development of network applications, Berkeley University in the United States implements a kind of communication protocol Socket on Unix, which enables programmers to access TCP/IP conveniently; Use Socket of TCP/IP to communicate: The server program binds a socket ...

1, File system view command df format df [options] [mount point] option Name Effect -a Display all file system information, including special file systems, such as / proc,/sysfs -h Display capacity in customary units, such as KB,MB or GB -T Show file system types -m Display capacity in MB -k Display capacity in kilobytes. The def ...